Disabling Toyota Alarm

Alright, Junk was right on two accounts-the CC on 40th is annoying, and the alarm downright blows.
I really want to remove/disable the alarm, for two reasons-
three different people drive this car on a regular basis, and we only have one key fob (that doesn't work that great anyway), and I don't want to pay $180 for two new ones.
I hate how the alarm goes off when the car is unlocked using a key. I wouldn't mind if you could set the alarm so that it only activated when you wanted it to, not every time you lock the doors.
Any suggestions?